Chettinad Idli is a popular South Indian breakfast dish made with fermented rice and lentil batter. The idlis are soft, fluffy, and have a slight tangy flavor. They are typically served with coconut chutney and sambar. The batter is made by grinding soaked rice and lentils together and fermenting it overnight. The idlis are steamed in special idli molds and are a healthy and nutritious breakfast option.